[R] animal models and lme

iwhite@staffmail.ed.ac.uk iwhite at staffmail.ed.ac.uk
Wed Jul 23 11:58:55 CEST 2003

Not convinced that responses so far have addressed the problem. The
model is

y = mu + U + e

where e is a vector of independendent errors with variance ve, and U
is a vector of random effects with covariance matrix va*A, where A is a
known matrix (which we can assume is a correlation matrix). If we know the
ratio (va/ve), this reduces to a GLS problem, but not otherwise. Usually
we have to estimate both ve and va.

ICAPB, University of Edinburgh
Ashworth Laboratories, West Mains Road
Edinburgh EH9 3JT
Fax: 0131 650 6564  Tel: 0131 650 5490
E-mail: iwhite at staffmail.ed.ac.uk

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